The Collaborative International Dictionary of English v.0.48:

Dianthus \Di*an"thus\, n. [NL., fr. Gr. ?, gen. ?, Zeus +
   'a`nqos flower.] (Bot.)
   A genus of plants containing some of the most popular of
   cultivated flowers, including the pink, carnation, and Sweet
   William.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Dianthus
    n 1: carnations and pinks [syn: Dianthus, genus Dianthus]